[ale] dual-headed X11 via a laptop?

[jb at sourceillustrated.com (John Wells)]

I have a Dell Inspiron i8200 with a Geforce 4 32 mb video card.

Seems I've read in the past that it was possible to configure laptops as
dual-headed displays (i.e., an attached monitor and the laptop screen
serving as two separate desktops), as opposed to simply having the laptop
screen duplicated on the connected monitor.

Is this truly possible, or am I mistaken?  Anyone doing/done it?

Thanks,
John



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